101821808 has 20 divisors (see below), whose sum is σ = 215214648. Its totient is φ = 46282560.

The previous prime is 101821801. The next prime is 101821831. The reversal of 101821808 is 808128101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101821801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289091 + ... + 289442.

Almost surely, 2^101821808 is an apocalyptic number.

It is an amenable number.

101821808 is an abundant number, since it is smaller than the sum of its proper divisors (113392840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101821808 is a wasteful number, since it uses less digits than its factorization.

101821808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578552 (or 578546 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 101821808 is about 10090.6792635580. The cubic root of 101821808 is about 466.9606320183.

Adding to 101821808 its reverse (808128101), we get a palindrome (909949909).

The spelling of 101821808 in words is "one hundred one million, eight hundred twenty-one thousand, eight hundred eight".